LQFP100 datasheet(39/204 Pages) STMICROELECTRONICS

39 / 204 page

DS8626 Rev 9

39/203

STM32F405xx, STM32F407xx

Description

or as peripheral alternate function. Most of the GPIO pins are shared with digital or analog

alternate functions. All GPIOs are high-current-capable and have speed selection to better

manage internal noise, power consumption and electromagnetic emission.

The I/O configuration can be locked if needed by following a specific sequence in order to

avoid spurious writing to the I/Os registers.

Fast I/O handling allowing maximum I/O toggling up to 84 MHz.

2.2.35

Analog-to-digital converters (ADCs)

Three 12-bit analog-to-digital converters are embedded and each ADC shares up to 16

external channels, performing conversions in the single-shot or scan mode. In scan mode,

automatic conversion is performed on a selected group of analog inputs.

Additional logic functions embedded in the ADC interface allow:

•

Simultaneous sample and hold

•

Interleaved sample and hold

The ADC can be served by the DMA controller. An analog watchdog feature allows very

precise monitoring of the converted voltage of one, some or all selected channels. An

interrupt is generated when the converted voltage is outside the programmed thresholds.

To synchronize A/D conversion and timers, the ADCs could be triggered by any of TIM1,

TIM2, TIM3, TIM4, TIM5, or TIM8 timer.

2.2.36

Temperature sensor

The temperature sensor has to generate a voltage that varies linearly with temperature. The

conversion range is between 1.8 V and 3.6 V. The temperature sensor is internally

connected to the ADC1_IN16 input channel which is used to convert the sensor output

voltage into a digital value.

As the offset of the temperature sensor varies from chip to chip due to process variation, the

internal temperature sensor is mainly suitable for applications that detect temperature

changes instead of absolute temperatures. If an accurate temperature reading is needed,

then an external temperature sensor part should be used.

2.2.37

Digital-to-analog converter (DAC)

The two 12-bit buffered DAC channels can be used to convert two digital signals into two

analog voltage signal outputs.

LQFP100 Scheda tecnica(PDF) 39 Page - STMicroelectronics